scholarly journals Strontium isotopic ratio in brines from the north-east of the Angara-Lenskiy artesian basin

2019 ◽  
Vol 98 ◽  
pp. 12001
Author(s):  
Sergey Alexeev ◽  
Ludmila Alexeeva ◽  
Orfan Shouakar-Stash
Keyword(s):  
Isotopic Composition ◽  
High Salinity ◽  
Isotopic Ratio ◽  
Oil Field ◽  
Rock Interaction ◽  
Artesian Basin ◽  
Terrigenous Sediments ◽  
North East ◽  
The North ◽  
Water Rock Interaction

The Sr isotopic composition was measured in a number of samples of highly concentrated oil-field brines from the Angara-Lenskiy artesian basin. The brines are contained in the salt-bearing and subsalt-bearing hydrogeological formations at a depth of 1,500-3,000 m. They have high salinity (385-530 g/L) and high Sr content (2.3-7.0 mg/L). The 87Sr/86Sr ratio ranges from 0.70800 to 0.713062. Most brine samples exhibit an isotopic composition similar to Vendian-Cambrian paleoocean water, however several samples from the Yaraktinskiy horizon are significantly more radiogenic than others. It suggests that a considerable amount of 87Sr is likely to have been carried from terrigenous sediments due to a water-rock interaction.

scholarly journals Geochemical and isotopic evidence of groundwater salinization processes in the Essaouira region, north-west coast, Morocco

2021 ◽  
Vol 3 (7) ◽  
Author(s):  
Otman EL Mountassir ◽  
Mohammed Bahir ◽  
Driss Ouazar ◽  
Abdelghani Chehbouni ◽  
Paula M. Carreira
Keyword(s):  
Groundwater Recharge ◽  
West Coast ◽  
Exchange Process ◽  
Environmental Isotopes ◽  
Annual Rainfall ◽  
Groundwater Salinization ◽  
Rock Interaction ◽  
North West ◽  
The North ◽  
Water Rock Interaction

AbstractThe city of Essaouira is located along the north-west coast of Morocco, where groundwater is the main source of drinking, domestic and agricultural water. In recent decades, the salinity of groundwater has increased, which is why geochemical techniques and environmental isotopes have been used to determine the main sources of groundwater recharge and salinization. The hydrochemical study shows that for the years 1995, 2007, 2016 and 2019, the chemical composition of groundwater in the study area consists of HCO3–Ca–Mg, Cl–Ca–Mg, SO4–Ca and Cl–Na chemical facies. The results show that from 1995 to 2019, electrical conductivity increased and that could be explained by a decrease in annual rainfall in relation to climate change and water–rock interaction processes. Geochemical and environmental isotope data show that the main geochemical mechanisms controlling the hydrochemical evolution of groundwater in the Cenomanian–Turonian aquifer are the water–rock interaction and the cation exchange process. The diagram of δ2H = 8 * δ18O + 10 shows that the isotopic contents are close or above to the Global Meteoric Water Line, which suggests that the aquifer is recharged by precipitation of Atlantic origin. In conclusion, groundwater withdrawal should be well controlled to prevent groundwater salinization and further intrusion of seawater due to the lack of annual groundwater recharge in the Essaouira region.

scholarly journals Strontium and 87Sr/86Sr isotopic ratio of ground brines in the northeastern Angara-Lena artesian basin

2021 ◽  
Vol 44 (2) ◽  
pp. 98-105
Author(s):  
L. P. Alekseeva ◽  
S. V. Alekseev
Keyword(s):  
Isotopic Composition ◽  
High Salinity ◽  
Isotopic Ratio ◽  
Sedimentary Basins ◽  
Formation Processes ◽  
Salt Composition ◽  
Strontium Content ◽  
Mass Spectrometers ◽  
Ionic Salt

The purpose of this study is to identify the major formation processes of the ionic and isotopic composition of chloride brines in the sedimentary basins of the Siberian platform. The object and subject of research are deep-seated strong, very strong and extremely saturated brines as well as their strontium content and the ratio of Sr stable isotopes. The groundwater ionic-salt composition was determined by traditional methods (titrimetric, gravimetric, flame photometry), the 87Sr/86Sr isotopic ratio was measured using mass-spectrometers (Irkutsk, Russia and Canada). The brines lying at the depth of 1500–3000 m were tapped and classified into saline and subsalt hydrogeological formations. Their feature is high salinity (385–530 g/L) and high content of strontium (2.3–7 g/L). The 87Sr/86Sr isotopic ratio ranges from 0.708 to 0.713062. By isotopic composition most of the brine samples are close to the waters of the Vendian-Cambrian paleoocean. However, some brine samples from the subsalt part of the sedimentary section of the basin are significantly enriched in the isotope 87Sr compared to the paleoocean waters and other samples. It could be due to the substantial input of 87Sr into the brines during the long-term interaction of groundwater with the host Lower Cambrian sandstones.

GEOLOGY OF THE NORTH-EAST MARGIN OF THE GREAT ARTESIAN BASIN QUEENSLAND, AUSTRALIA

1965 ◽  
Vol 5 (1) ◽  
pp. 179
Author(s):  
Edward F. Durkee
Keyword(s):  
Sedimentary Rocks ◽  
The South ◽  
The West ◽  
Artesian Basin ◽  
Late Mesozoic ◽  
Great Artesian Basin ◽  
North East ◽  
The North ◽  
South West ◽  
Basin Margin

The north-east margin of the basin as described herein comprises some 40,000 square miles situated regionally between the Bowen basin and the Drummond Range on the east and north-east respectively and the towns of Longreach, Charleville, and Mitchell on the west and south. The limit of the present-day Great Artesian basin in this area is marked by south-east striking outcrops of the Jurassic Precipice Sandstone.The stratigraphy of the area can be grossly subdivided into three time-rock units as follows:Pre-PermianPermian-TriassicLate Mesozoic and Tertiary.Pre-Permian rocks of importance include thick Devonian and Carboniferous units. Marine and evaporite facies are present in the Devonian in the south-west (Adavale basin), changing to more continental facies with volcanic and some marine incursions to the north-east (Drummond basin). Carboniferous units are dominantly paralic to continental types. The Devonian and Carboniferous systems were subjected to various degrees of pre-Permian tectonism and removal and, because of this, the existing occurrences of these systems are only fragments of their original extent. Permian and Triassic, marine to continental units were deposited across the area, thinning from east to west in possible cycles of transgression and regression. In addition to thinning regionally, these systems show marked variation in thickness due to transgression and drape and compaction over major, pre-Permian structural trends.Subsequent to deposition of the Triassic, a pronounced tectonic change was introduced. Previously negative areas to the north-east (Drummond basin—Springsure Shelf) began to rise and the Middle to Late Mesozoic subsidence and filling of the Great Artesian basin to the south-west commenced. Therefore, Triassic and Permian strata thicken regionally to the north-east under the Great Artesian basin margin, while post-Triassic strata thicken south-westward, in the opposite direction, into the basin.Three dominant structural trends are reflected in the sedimentary rocks of the area. These are:North-east trends under much of the Great Artesian basin margin.North-westerly trends of the Drummond basin to the north-east of the Great Artesian basin margin.Northern trends of the Denison trough east of the Great Artesian basin margin.

scholarly journals Holocene shifts in sub-surface water circulation of the North-East Atlantic inferred from Nd isotopic composition in cold-water corals

2019 ◽  
Vol 410 ◽  
pp. 135-145 ◽  
Author(s):  
Quentin Dubois-Dauphin ◽  
Christophe Colin ◽  
Mary Elliot ◽  
Arnaud Dapoigny ◽  
Eric Douville
Keyword(s):  
Surface Water ◽  
Isotopic Composition ◽  
Cold Water ◽  
Water Circulation ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
Nd Isotopic Composition

scholarly journals Interannual analysis of high spatially-resolved δ18O and δ2H data in precipitation across North-East Italy

2020 ◽  
Author(s):  
Mauro Masiol ◽  
Daniele Zannoni ◽  
Barbara Stenni ◽  
Giuliano Dreossi ◽  
Luca Zini ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Isotopic Composition ◽  
Unconfined Aquifer ◽  
Interesting Case ◽  
Point Of View ◽  
Water Isotopes ◽  
Stable Water Isotopes ◽  
Weather Factors ◽  
North East ◽  
The North

<p>Stable water isotopes are widely-used tracers to investigate hydrological processes occurring in the atmosphere and to determine the geospatial origin of water, i.e. to acquire useful information about the hydrological cycles over catchment basins and to find the origin of water recharging rivers, aquifers, and springs. Mapping the isotopic composition of precipitation provides hydrological and climate information at regional and global scales. However, the isotopic composition of precipitation is usually analyzed at large scales with a limited spatial resolution. In Italy, a few studies mapped the oxygen stable isotopes using annually-averaged data, not accounting for the strong seasonality of the isotopic composition linked to climatic and weather factors. To partially fill this gap, the present study proposes a detailed analysis of more than 2250 isotope data (δ<sup>18</sup>O, δ<sup>2</sup>H, and deuterium excess) related to precipitations collected in the Friuli Venezia Giulia (FVG) region (Italy) with monthly or seasonal frequency in 36 sites between 1984 and 2015.</p><p>The FVG region lies at the north-eastern end of Italy, bordering Austria in the North and Slovenia in the East, and extends over ~7.9·10<sup>3</sup> km<sup>2</sup>. From a hydrogeological point of view, FVG is an interesting case study. Large highly-permeable carbonate aquifers are present in the Alps and Prealps, while the southern part of the region is characterized by an alluvial plain, split by the spring belt into two sectors: the High Plain in the North, characterized by an highly-permeable unconfined aquifer, and the Low Plain in the South, characterized by a system of confined and artesian aquifers. All the aquifers are recharged by the effective precipitations which in the FVG exhibits among the highest annual precipitation rates in Italy (with peaks >3000 mm/year).</p><p>For the present research, the isotopic data were used: (i) to analyze the spatial and seasonal variability of isotopic composition; (ii) to relate water isotopes with orography and weather parameters collected from meteorological stations as well as using ECMWF ERA5 reanalysis; (iii) to reconstruct the local meteoric water lines across the FVG at annual and seasonal bases; (iv) to quantify interannual trends and analyze their spatial distribution; and (iv) to model the spatial distribution of isotope content in precipitation and create annual and seasonal maps.</p>

scholarly journals Measurements of aerosol and CCN properties in the Mackenzie River delta (Canadian Arctic) during spring–summer transition in May 2014

2018 ◽  
Vol 18 (7) ◽  
pp. 4477-4496 ◽  
Author(s):  
Paul Herenz ◽  
Heike Wex ◽  
Silvia Henning ◽  
Thomas Bjerring Kristensen ◽  
Florian Rubach ◽  
...  
Keyword(s):  
Particle Number ◽  
Oil Field ◽  
River Delta ◽  
The Arctic ◽  
Air Mass ◽  
Back Trajectories ◽  
Air Masses ◽  
North East ◽  
The North ◽  
Mackenzie River

Abstract. Within the framework of the RACEPAC (Radiation–Aerosol–Cloud Experiment in the Arctic Circle) project, the Arctic aerosol, arriving at a ground-based station in Tuktoyaktuk (Mackenzie River delta area, Canada), was characterized during a period of 3 weeks in May 2014. Basic meteorological parameters and particle number size distributions (PNSDs) were observed and two distinct types of air masses were found. One type were typical Arctic haze air masses, termed accumulation-type air masses, characterized by a monomodal PNSD with a pronounced accumulation mode at sizes above 100 nm. These air masses were observed during a period when back trajectories indicate an air mass origin in the north-east of Canada. The other air mass type is characterized by a bimodal PNSD with a clear minimum around 90 nm and with an Aitken mode consisting of freshly formed aerosol particles. Back trajectories indicate that these air masses, termed Aitken-type air masses, originated from the North Pacific. In addition, the application of the PSCF receptor model shows that air masses with their origin in active fire areas in central Canada and Siberia, in areas of industrial anthropogenic pollution (Norilsk and Prudhoe Bay Oil Field) and the north-west Pacific have enhanced total particle number concentrations (NCN). Generally, NCN ranged from 20 to 500 cm−3, while cloud condensation nuclei (CCN) number concentrations were found to cover a range from less than 10 up to 250 cm−3 for a supersaturation (SS) between 0.1 and 0.7 %. The hygroscopicity parameter κ of the CCN was determined to be 0.23 on average and variations in κ were largely attributed to measurement uncertainties. Furthermore, simultaneous PNSD measurements at the ground station and on the Polar 6 research aircraft were performed. We found a good agreement of ground-based PNSDs with those measured between 200 and 1200 m. During two of the four overflights, particle number concentrations at 3000 m were found to be up to 20 times higher than those measured below 2000 m; for one of these two flights, PNSDs measured above 2000 m showed a different shape than those measured at lower altitudes. This is indicative of long-range transport from lower latitudes into the Arctic that can advect aerosol from different regions in different heights.

Dosing Concentration Design of Chemical Anti-Scale in the ASP Flooding of Lamadian Oilfield

2014 ◽  
Vol 675-677 ◽  
pp. 1551-1555
Author(s):  
Cheng Feng Ren
Keyword(s):  
Drug Concentration ◽  
Simulation Experiment ◽  
Design Method ◽  
Oil Field ◽  
Actual Situation ◽  
Scaling Effect ◽  
North East ◽  
The North ◽  
Asp Flooding ◽  
Extraction Liquid

Aimed at the analysis of the ion changes of the North east block in Lamadian oilfield asp flooding field in different period, we puts forward a new and more effective anti-scale agent combined with actual situation on site and the design method of the drug concentration. By combining the extraction liquid ion anti-scale indoor simulation experiment, the changes of different scale anti-scale agent dosing concentration during the period of experience formula. And the north east block in Lamadian oil field, the application of asp flooding experiment, achieved good anti-scaling effect, because of the scale pump inspection cycle to achieve an average of 300 days or more.

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